Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
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岩手県 八幡平市 五日市の名字

About 40 【小山田】5
About 30 【羽沢】4
About 10 【藤田】7
About 10 【佐藤】7
Very rare 【勝又】6
Very rare 【斎藤】7
Very rare 【田鎖】5
Very rare 【豊川】5
Very rare 【畠山】6
Very rare 【吉村】6